test: Capture failing test for shadow exclude

test/integration/full/context/context.html

@@ -7,7 +7,6 @@
 	<script src="/node_modules/mocha/mocha.js"></script>
 	<script src="/node_modules/chai/chai.js"></script>
 	<script src="/axe.js"></script>
-	<script src="/test/testutils.js"></script>
 	<script>
 		mocha.setup({
 			timeout: 10000,
@@ -20,7 +19,30 @@
 	<div id="frame-container">
 		<iframe id="myframe" src="frames/level1.html"></iframe>
 	</div>
+	<ul style="display: none;">
+		<p>Text</p>
+		<p>Text 2</p>
+	</ul>
+	<div id="shadow-container">
+		<p id="test-passes">Passing Text</p>
+		<div id="shadow-host"></div>
+	</div>
 	<div id="mocha"></div>
+	<script>
+	var host = document.getElementById('shadow-host');
+	var list = document.getElementsByTagName('ul')[0];
+	var shadowRoot = host.attachShadow({ mode: 'open' });
+	var shadowContent = document.createElement('div');
+	shadowContent.setAttribute('style', 'background-color: #333');
+	var content = document.createElement('p');
+	content.style.color = '#000';
+	content.textContent = 'Failing Text';
+	shadowContent.appendChild(content);
+	var shadowList = shadowContent.appendChild(list);
+	shadowList.style.display = 'block';
+	shadowRoot.appendChild(shadowContent);
+	</script>
+	<script src="/test/testutils.js"></script>
 	<script src="context.js"></script>
 	<script src="/test/integration/adapter.js"></script>
 </body>

test/integration/full/context/context.js

@@ -2,11 +2,13 @@ describe('context test', function () {
 	'use strict';
 
 	var config = { runOnly: { type: 'rule', values: ['html-has-lang'] } };
+	var shadowSupported = axe.testUtils.shadowSupport.v1;
+
 	before(function (done) {
 		axe.testUtils.awaitNestedLoad(done);
+		axe._tree = undefined;
 	});
 
-
 	describe('direct exclude', function () {
 
 		describe('no include', function () {
@@ -105,6 +107,17 @@ describe('context test', function () {
 			});
 		});
 
+		(shadowSupported ? it : xit)
+		('should find no nodes in Shadow DOM', function (done) {
+			var sConfig = { runOnly: { type: 'rule', values: ['list', 'color-contrast'] } };
+			axe.run({ include: [['#shadow-container']], exclude: [['#shadow-host']] }, sConfig, function (err, results) {
+				assert.isNull(err);
+				assert.lengthOf(results.violations, 0, 'violations');
+				assert.lengthOf(results.passes, 2, 'passes');
+				done();
+			});
+		});
+
 		describe('no include', function () {
 
 			it('should find no violations given a selector array', function (done) {